etichols



J. S. NICHOLS. STEAM BD ILHER. APPLICATION FILED IIIAY 22. I9I5.

www3,

Ptnted June 10, M319,

narran .sanare rarnnr onirica.

Jardins s. interacts.,V or ATLANTA, esonera.

stream-norma Specification of Letters Patent. Patented June 1U, j g;

Application led May 22, 1915. Serial N o. 29,833.

ing the superheater from the direct action of the iire and for increasing the heating action upon the Water of the boiler, thecsuperheater and its protecting means utilizing to the greatest degree the heat energy from the fire and contributing to increase the steaming capacity and efiiciency of the boiler. Y Y

4llo these and other ends, the invention consists in certain improvements, and combinations and arrangements of parts, all as -will be hereinafter more fully described, the novel features being 'pointed out particularly in the claims at the end of the specification.

In the accompanying drawing Figure l represents a longitudinal section taken through the tire-box end of a boiler showing the present invention applied thereto.

Fig. 2 represents a horizontal section on the line 2-2 of Fig. 1. n

Similar parts are Vdesignated by the same reference characters in the several vievvs.v

The present invention is applicable generally to boilers of various types, and it is more especially applicable'to boilers of the locomotive type or those having an internal re-bo'x. The present invention is also applicable especially to locomotives 'or to boilers for generating superheated steam. In the present instance, the invention is shown and will be described as applied to a loco motive boiler for generating superheated steam, but it is to be understood that. the invention is capable of other uses and that modix'ication or changes in the construction and arrangement of the parts may be made Within thescope of the annexed claims an which will be included thereby.

In the present instance, 1 designates the rear portion ef theouter shell of a boiler of the locomotive type, and i? represents the fire-box or combustion space which is inheater with Water.

closed Within the boiler, a grate 3 being located at the bottom of the re-box for the fire, and a crown sheet fl and rear tube sheet 5 constitute the upper and forward Walls, respectively, of the fire-box. Below the rear tube sheet is formed the front Water leg 6 which forms part of the Water space of the boiler. The rear end of the tire-box4 is closed by the outer and inner shells 7 and 8, respectively, Which form between them the rear Water leg 9 which is also in communication With or formsl part of the Water `space of the boiler, and a re door 10 extends through' the shells 7 and 8 and provides anopening through which fuel may be introduced into the fire-box.

The {ire-box contains a steam superheater or elements or units of a steam superheater.-

In the construction shown, a suitable number of steam superheating elements or units in the form of headers or manifolds 11 is Each header' 11 is connected by the pipes 13- A to a set of steam superheating units which are contained in the iues 14C of the boiler, thesaturated steam being conducted to the headers by the pipes 12 and subjected While in the headers to the superheating action of the gases contained in the fire-box.v The pipes 13 leading from theheaders conduct the superheated steam to the point Where such steam is to be used, either directly, or through superheater units contained in the iiues, as previously described.l ln order to prevent overheatingand consequent liability to burning or injury to the super-heater when the boileris fired and before the superheater contains -steam to prevent such overheating, means-is provided for flooding the supen As shown, a pipe 15 leads to the steam supply pipes 12 of the superheater, and this pipe 15 is connected preferably to receive Water from the Water space of theboiler bythe pipe 16, a valve 17 being provided bet'ween'the-pipes 15 and 16 to admit Water to the superheater to flood los .itil

i to the water in the boiler, the water wall,

however, permitting the highly heated gases from the fire-box to act upon the superheater after such gases have been reduced in temperat'ure to a suitable point which will insure eiiicient superheating of the steam but which vwill avoid overheating of or injury to the superheater.

In the present instance, the water wall or superheater .protectin medium comprises a unit 18 which exten s continuously across the space in'front of the superheatei, and a suitable number of units 19 which extend across the space in front of the superheater in laterally spaced relation to one another,

providing passages or interstices through` which the-highly heated gases from the lire may circulate, but it is to be understood that the continuouselement 18 may be used alone or one or more rows 'of the units 19 may be used alone in some cases. It is preferable,

however, to use both the continuous water wall 18 and the units 19 in connection with a locomotive boiler Where a very intense heat is developed in thefire-box by reason of the fbr'ced draft usually employed. The con' tinuous water wall 18 and the units 19 occupy an inclined position between the fire and the superheater, andthey are spaced from the sides of the fire-box to provide passages 20 through which the lgases may 4circulate around the sides of the protecting medium and thus reach the superheater 1ndirectly, and they are also spaced from the rrown sheet i and the water leg 6 to provide passages through which the gases may circulate above and4 below the protecting medium and thus reach the superheater indirectly.` In using two or more rows, of units 19, the units of one row are preferably staggered in relation to those of the I l adjacent row,gthus providing tortuous passages between these, units for the circulation of the gases, and increasing the surface afforded by the units'19 for the absorption of heat from these gases. In using the continuous water wall 18 in connection with the units 19, it is also preferable to arrange the water wall 18 rearmost, that its to say, between the units 19 and the're, thus com-4 pelling the gases to passeither around the sides or above and below this water wall 18l before reaching the units 19 or superheater, and this retarding in the outlet of the-gases aords ample opportunity for .the heat of such gases to be absorbed by the water and steam heating surfaces, of the boiler. After the gases have passed around the sides and above and below'fthe water wall 18, such gases may flow behind the water wall and laterally through the tortuous passages between the units 19. The water wall 18 receives water from the .water le'g 6 by a suitable number of pipes. 21 and discharges the water (the temperature of which has been raised while passing through the waterwall 18) through a suitable number of pines 22 into the space above the ,crown sheet 4. "Each unit 19 also receives water from the water leg Giby a pipe 23 and discharges the water therefrom through the pipes 24 to the space above the crown` sheet 4. In order to deiiect the most highly heated gases and thereby prevent their direct. escape to the fines of the boiler, it is preferable to concave the water wall-` 18 andthe units 19 toward the rear, the intensely heated-gases in rising being diverted rearwardly, thus affording ample time for the absorption of the heat of such gases by the boiler. v.

.The units 19 are' preferably diamondshaped lin cross-section, or substantially so,

to provide interstices or gas passages of uni form width between them.

The present invention provides l.means wherebythe intensely heated gases are re' tarded in their escape from the fire-box,

andthe superheater or superheater units in the tire-box are protected from injury' 'by such intensely heated gases, the shielding. or rotecting medium ad ing to the heating eciency of the boiler by transmittingl large degree heat from the intensely gases to thel water in the boiler.

.I claim as my invention i l. 1. In a steam boiler having a nre-box, the combination of 'a superheater in the for- 1n a eatcd i ward portion of the refbpx, anda water wall` in the fire-box in rear of the superheater comprising a plurality of rows of transversely spaced hollow units formingpinterstices between them for the passage of the, gases and' having their tops and bottoms spaces being formed between the sides of the water wall and the adjacent sides of the lire-bor. for the passage of gases-to the superheater. l'

- 2. .In a steam boiler having a fire-box, the combination of a superheater in the forward ortion of the lire-box, a water wall located) toward the front of the {ire-box in rear of the superheatei: comprising a' substantially impertforate hollow body connected to the waterspace of the boiler and extending continuouslyin a,direction transversely ofthe iirebox, spacegbeing formed at the sides of said body for ,the passageA of `connectedto the water space ofthe boiler, n

gases to, the superheater, and a plurality of hollow units connected tothe .water space of '11 1,306,613. v I l e.

the boer and'l arranged '1n front. of said spaces at the sides thereof for the'passeg bod)T and n reati* of the superheater, said of the gases to the superheater. l units forming interstices between them for In testimony whereof I have hereunto set the furnace gasses.; my hand in presence of two. subscribing `5 3. In a steam bpler avlflg a fifi-box alrd Wltnesses.

ues to receive ases t ere rom, t e com i- A 1' nation of a steagm superheater arranged in .v s S NICHOLS the fLre-box adjacent to the entrances of said Witnesses: y `1ues,"and a Water wallv connected to the H. W, REESE, 10 Water space of they boiler and providing l R. Foss, 

